diff options
Diffstat (limited to 'sysdeps/x86_64')
| -rw-r--r-- | sysdeps/x86_64/fpu/e_log2l.S | 8 | ||||
| -rw-r--r-- | sysdeps/x86_64/fpu/libm-test-ulps | 22 |
2 files changed, 29 insertions, 1 deletions
diff --git a/sysdeps/x86_64/fpu/e_log2l.S b/sysdeps/x86_64/fpu/e_log2l.S index 956489fc3e..c12906d456 100644 --- a/sysdeps/x86_64/fpu/e_log2l.S +++ b/sysdeps/x86_64/fpu/e_log2l.S @@ -45,7 +45,13 @@ ENTRY(__ieee754_log2l) fnstsw // x-1 : x : 1 andb $0x45, %ah jz 2f - fstp %st(1) // x-1 : 1 + fxam + fnstsw + andb $0x45, %ah + cmpb $0x40, %ah + jne 5f + fabs // log2(1) is +0 in all rounding modes. +5: fstp %st(1) // x-1 : 1 fyl2xp1 // log(x) ret diff --git a/sysdeps/x86_64/fpu/libm-test-ulps b/sysdeps/x86_64/fpu/libm-test-ulps index bb549d2b0d..92fef5a134 100644 --- a/sysdeps/x86_64/fpu/libm-test-ulps +++ b/sysdeps/x86_64/fpu/libm-test-ulps @@ -1665,6 +1665,28 @@ ifloat: 1 ildouble: 1 ldouble: 1 +Function: "log2_downward": +double: 2 +float: 2 +idouble: 2 +ifloat: 2 + +Function: "log2_towardzero": +double: 1 +float: 1 +idouble: 1 +ifloat: 1 +ildouble: 1 +ldouble: 1 + +Function: "log2_upward": +double: 2 +float: 2 +idouble: 2 +ifloat: 2 +ildouble: 1 +ldouble: 1 + Function: "log_downward": float: 1 ifloat: 1 |